Thermostat



FIG. 1 is a perspective view illustrating the front, right side and bottom of the thermostat;

FIG. 2 is a top view of the thermostat;

FIG. 3 is a front view of the thermostat;

FIG. 4 is a left side view of the thermostat;

FIG. 5 is a right side view of the thermostat; and,

FIG. 6 is a bottom view of the thermostat. 

The ornamental design for a thermostat, as shown and described. 